Question Regarding Tikka T3 300 Win Mag Load??

[blacktailcentral]

Finding lands, then getting the bullet to jump not a mile will help keep bullet concentric to bore. Tikkas do have mag restrictions so likely that will be your contraint.

 

[blacktailcentral]

that out of a tikka?

Loaded them for a buddies proof research elevation

 

[Dobeman887]

H4831sc 75 gr
174 hammer hunter
3.46, .050” of lands (longer than sami spec)
3100fps 24 inch proof
4 shot group below

I like the accuracy of Hammer bullets (loaded some for 350 Legend), but they are damn expensive. In this case, I don't know if I can fit them into the mag for a Tikka-with that COL I am 99% sure I can't. I could put them into the action individually but I'm not going to do that-defeats the purpose of having rounds quickly available.

 

[blacktailcentral]

I like the accuracy of Hammer bullets (loaded some for 350 Legend), but they are damn expensive. In this case, I don't know if I can fit them into the mag for a Tikka-with that COL I am 99% sure I can't. I could put them into the action individually but I'm not going to do that-defeats the purpose of having rounds quickly available.

The unknown muntions bottom metal and mag gets you go 3.54” coal. Just a thought so you could get closer to the lands and not single feed

 

[Harvey_NW]

Finding lands, then getting the bullet to jump not a mile will help keep bullet concentric to bore. Tikkas do have mag restrictions so likely that will be your contraint.

I'm still waiting to see proof of this actually improving group size, I've been asking for years and to this day I haven't seen a statistically valid data set. This principle applies more to throat dimension allowing for in bore tilt, with the 300 Win Mag being .3150"/.007" over bullet diameter, vs something like a 6.5 PRC that's spec'd at .2645".

OP I highly suggest shooting some bigger samples testing both theories, I think 20 shots would do. Shoot a 10 shot group of 2 at a time letting it cool completely in between, and then a 10 shot string and compare the groups. If they're the same (+/- 20%), that's what that rifle and combo produces. If the first one is a tiny little cluster and the second is scatter pattern, either live with 2 guaranteed shots at a time, or replace the barrel. I'll bet you a virtual beer they're the same.

 

[Dobeman887]

The unknown muntions bottom metal and mag gets you go 3.54” coal. Just a thought so you could get closer to the lands and not single feed

When I get home tonight I will try and remember to measure the mag with my calipers, but I know the tip of my cartridges are really pushing the limit at 3.34. As I said earlier in the thread this is a Tikka T3, approximately 13yrs old. It has the 1:11 twist rate. I don't know when Tikka switched to 1:10, probably when they rebranded the rifle the "T3x"?

 

[blacktailcentral]

I'm still waiting to see proof of this actually improving group size, I've been asking for years and to this day I haven't seen a statistically valid data set. This principle applies more to throat dimension allowing for in bore tilt, with the 300 Win Mag being .3150"/.007" over bullet diameter, vs something like a 6.5 PRC that's spec'd at .2645".

OP I highly suggest shooting some bigger samples testing both theories, I think 20 shots would do. Shoot a 10 shot group of 2 at a time letting it cool completely in between, and then a 10 shot string and compare the groups. If they're the same (+/- 20%), that's what that rifle and combo produces. If the first one is a tiny little cluster and the second is scatter pattern, either live with 2 guaranteed shots at a time, or replace the barrel. I'll bet you a virtual beer they're the same.

Yes large sample sizes are definitely the way to go to proof out some of these loading theories. The concentricity idea also has alot to do with how straight the chamber is cut to the bore. But with the win mag head spacing off the belt i think being closer to the lands will generally help with accuracy, relative to more modern case designs

 

[blacktailcentral]

When I get home tonight I will try and remember to measure the mag with my calipers, but I know the tip of my cartridges are really pushing the limit at 3.34. As I said earlier in the thread this is a Tikka T3, approximately 13yrs old. It has the 1:11 twist rate. I don't know when Tikka switched to 1:10, probably when they rebranded the rifle the "T3x"?

When I get home tonight I will try and remember to measure the mag with my calipers, but I know the tip of my cartridges are really pushing the limit at 3.34. As I said earlier in the thread this is a Tikka T3, approximately 13yrs old. It has the 1:11 twist rate. I don't know when Tikka switched to 1:10, probably when they rebranded the rifle the "T3x"?

With the 1:11” twist i would also be conscious of stability of the bullet, i would probably try the 150 ttsx bt if you want to stick with barnes. This bullet should be shorter than the 168 so may help you with coal.

 

[Andouille]

With the 1:11” twist i would also be conscious of stability of the bullet, i would probably try the 150 ttsx bt if you want to stick with barnes. This bullet should be shorter than the 168 so may help you with coal.

I strongly disagree, and know this is not true. It's well known that 1:11 300 WSM Tikka will stabilize up to 200gr lead bullets, for example 200 eld-x factory ammo, and nearly as heavy solid coppers such as 180ttsx factory ammo. A quick search on Rokslide can confirm this fact. 150ttsx has a neutered ballistic coefficient compared to 168ttsx, so maximum range suffers despite the increased velocity.

 

[blacktailcentral]

I strongly disagree, and know this is not true. It's well known that 1:11 300 WSM Tikka will stabilize up to 200gr lead bullets, for example 200 eld-x factory ammo, and nearly as heavy solid coppers such as 180ttsx factory ammo. A quick search on Rokslide can confirm this fact. 150ttsx has a neutered ballistic coefficient compared to 168ttsx, so maximum range suffers despite the increased velocity.

There is a big difference in what a copper and a lead bullet needs to stabilize…. Sectional density and bearing surface are much different between a mono and a lead bullet.

 

[blacktailcentral]

I strongly disagree, and know this is not true. It's well known that 1:11 300 WSM Tikka will stabilize up to 200gr lead bullets, for example 200 eld-x factory ammo, and nearly as heavy solid coppers such as 180ttsx factory ammo. A quick search on Rokslide can confirm this fact. 150ttsx has a neutered ballistic coefficient compared to 168ttsx, so maximum range suffers despite the increased velocity.